Intermitent stutter....
I take it that the fuel tank was empty over the 2 years? If not, then drain the tank and put some fresh petrol in there.
Or
Carbs are not pushed fully home on the rubber mounts, letting air in where it shouldnt. Undo carbs and re-seat them. If still not right, give them a clean, and balance.
or
Plugs. I take it when you serviced it, you put in new plugs?
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